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本文讨论同名多边形经多层叠置后生成新多边形的精度问题，给出了新多边形重心、面积和周长的方差与协方差的估计公式，并通过算例说明了在矿山ＧＩＳ中的应用方法。
In this paper, we discuss the accuracy of generating polygons with the same name and polygons, and derive the formulas for estimating the variance and covariance of the center of gravity, area and perimeter of the new polygons. Finally, we illustrate the application of GIS in mine GIS.